1. Jilin University,College of Computer Science and Technology,Changchun,China,130012
2. Shanghai Jiao Tong University,Department of Electronic Engineering,Shanghai,China,200240
3. Northeast Normal University,School of Information Science and Technology,Changchun,China,130024
4. Dalian University of Technology,School of Computer Science and Technology,Dalian,China,116024
5. Nanyang Technological University,School of Computer Science and Engineering,Singapore,Singapore,639798